The 17 Piece Plastic Cup Set with magnets applies a mild acu-pressure to the body. The cups promote pain relief by decreasing inflammation and increasing the flow of blood. Each set includes 7 red and 8 blue color coded, 0.3" dia, 1,000 gauss, spring adjustable, 0.3" dia x 1.7" long, removable magnetic insert probes. These fit the 2" and 1.5" dia cups. Set of 17 includes 13 of the 2" dia cups and 1 each of the 1.8", 1.5", 1.3", and 1" dia cups. Each set comes with a pistol grip hand pump, extension tube and carrying case.